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AUXILIARY SYSTEM SWITCHING VALVE The function of the auxiliary system switching valve is to transmit right hand system pressure to the lower rudder PCU under normal operating conditions. With loss of RH hydraulic system pressure, the switching valve shuttles and applies Auxiliary System pressure to the lower rudder PCU. The valve shuttles strictly in accordance with the RH System pressure and does not rely on any software or electrical interface to function. AUXILIARY SYSTEM PRESSURE FILTER The aux system contains a pressure filter. This assembly filters the supply pressure fluid coming in from the DCMP. It is made up of a filter element and a bowl, a differential pressure indicator, and an automatic shutoff device. The filter is a non-bypassing design. The flow through the assembly is blocked when the bowl is removed. A filter element is provided which removes 100% of all contaminants larger than 15 microns and is a non-cleanable type. The auxiliary system pressure filter and the case drain filter element used on the filter manifolds of the left and right systems are identical, and interchangeable. May 06/2005 Flight Crew Operating Manual Volume 2 REV 2 CSP 100-6 13-01-07 POWER TRANSFER UNIT DESCRIPTION The Power Transfer Unit (PTU) consists of a hydraulic motor coupled mechanically through a drive shaft to a hydraulic pump. When the PTU selector valve is energized, the hydraulic motor is driven by pressure from the right hydraulic system. The pump side of the PTU is connected to the left system and is dedicated to operation of the landing gear. The PTU also provides pressurization for the left hydraulic system reservoir. -the PTU will only start when the left engine or the left EDP is inoperative or failed |
